<template>
  <view>
    <!-- 自定义搜索组件 -->
    <my-search @click.native="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <scroll-view scroll-y class="left-scroll-view" :style="{height: wh + 'px'}">
        <block v-for="(cate, index) in cateList" :key="index">
          <view 
            class="left-scroll-view-item" 
            :class="{active: index === active}"
            @click="activeChange(index)"
          >{{cate.cat_name}}</view>
        </block>
      </scroll-view>
      <scroll-view 
        scroll-y 
        class="right-scroll-view" 
        :style="{height: wh + 'px'}"
        :scroll-top="scrollTop"
      >
        <view 
          v-for="(cate2, index2) in cateLevel2" 
          :key="index2"
          class="cate-lv2"
        >
          <view class="cate-lv2-title">
            / {{cate2.cat_name}} /
          </view>
          <view class="cate-lv3-list">
            <view 
              class="cate-lv3-item" 
              v-for="(cate3, index3) in cate2.children" 
              :key="index3"
              @click="gotoGoodsList(cate3)"
            >
              <image :src="cate3.cat_icon"></image>
              <text>{{cate3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins: [badgeMix],
    data() {
      return {
        wh: 0,
        cateList: [],
        active: 0,
        cateLevel2: [],
        scrollTop: 0
      };
    },
    onLoad() {
      const systemInfo = uni.getSystemInfoSync()
      this.wh = systemInfo.windowHeight - 50
      this.getCateList()
    },
    methods: {
      async getCateList() {
        const { data } = await uni.$http.get('/api/public/v1/categories')
        if (data.meta.status !== 200) return uni.$showMsg()
        this.cateList = data.message
        this.cateLevel2 = data.message[0].children
      },
      activeChange(index) {
        this.active = index
        this.cateLevel2 = this.cateList[index].children
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      gotoGoodsList(cate3) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + cate3.cat_id
        })
      },
      gotoSearch() {
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;
  .left-scroll-view {
    width: 120px;
    .left-scroll-view-item {
      background-color: #F7F7F7;
      text-align: center;
      line-height: 60px;
      font-size: 12px;
      &.active {
        background-color: #FFFFFF;
        position: relative;
        &::before {
          content: '';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
  .right-scroll-view {
    height: 120px;
    .cate-lv2-title {
      font-weight: bold;
      text-align: center;
      font-size: 12px;
      padding: 15px 0;
    }
    .cate-lv3-list {
      display: flex;
      flex-wrap: wrap;
      .cate-lv3-item {
        width: 33.3%;
        display: flex;
        flex-direction: column;
        align-items: center;
        margin-bottom: 10px;
        image {
          width: 60px;
          height: 60px;
        }
        text {
          font-size: 12px;
        }
      }
    }
  }
}

</style>
